Scales

Scales are the most important part of a measurement system. They are used to assign numbers to objects or events according to a set of rules. The rules are used to define the relationship between the numbers and the objects or events. The rules can be simple or complex, depending on the type of scale being used.

There are four types of scales: nominal, ordinal, interval, and ratio. Each type of scale has its own set of rules for assigning numbers to objects or events. The type of scale used depends on the level of measurement being used.